Magnifying Glass With the Image at Infinity: A person uses a converging lens of focal length 5.0 cm as a magnifying glass. What is the angular magnification if the person's eye is relaxed and has a near point of 25 cm?
A. 4.0
B. 5.0
C. 6.0
D. 7.0
Answer: B
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Protostars are observable by radio telescopes but hard to detect in visible light because they have ________ and are ________.
A. low surface temperature; very distant B. small size; very distant C. low surface temperature; surrounded by dust D. small size; very hot
One morning you discover that a tire on your auto is in need of air. This is visible: it has flattened significantly. Significant flattening indicates low air pressure
A. only if all tires are equally flattened; otherwise it is just low atmospheric pressure. B. and higher temperature. C. because more of the tire's surface area is required to provide same amount of force. D. and less weight.
LR Circuits: The figure shows a circuit. The ideal battery has a constant terminal voltage of ? = 27 V, the inductance is L = 0.40 H, and the resistances are R1 = 12 ? and R2 = 9.0 ?. Initially the switch S is open with no currents flowing. Then the switch is suddenly closed.(a) What is the current in the resistor R1 the instant after the switch is closed?(b) After leaving the switch has been closed for a very long time, it is opened again. Just after it is opened, what is the current in R1?
Fill in the blank(s) with the appropriate word(s).
Which two bodies show evidence of heavy cratering?
a. Mercury and Venus b. Mercury and Earth c. Mercury and Earth’s Moon d. Earth and Venus e. Earth and Mars